These are just a few ideas I had for the game that I thought would be fun.

what if you could send a message through the phone lines like in Steven Kings book Cell? Infect everyone who answers their phone and effectivly killing communication. Another idea is that you could have a main terrorist that you can plop down and have full control over. Unknown to the police (unless you get caught) You would sow the seeds of madness into the society. Spreading the message of rebellion to others who continue to spread it until they burst into a riot. You could sabotage cell signals, phone lines, roads, buildings, plant car bombs, etc. Your actions will make the people paranoid and slowly begin to lose trust in their local government as the police force fails to protect them.You would be like a kid with a match. You control the spark, but are powerless over the flames.

Also, a fun idea would be to make a car driver have road rage or something and have him aim for people :P